A brief look at the article shows you the dead woman was a lung transplant patient.

Transplant patients take drugs to suppress their immune systems, to avoid rejecting the donated organ.

So transplant patient + covid carrier = dead transplant patient.

Fully vaccinated people can carry covid too (they just don't get as sick, statistically), so the fact that she caught it - they claim - from an unvaccinated person doesn't actually mean much.

Pretending there's anything sinister about this is making a mountain out of a molehill, although there's no denying that if she did meet an unvaccinated person it would have been better for her if she hadn't.